Scorpion

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Background

Former private investigator Mac Gargan was hired by J. Jonah Jameson to find out how Peter Parker was able to get incredible pictures of Spider-Man.Gargan's efforts to locate Peter in order to find out the truth triggered Parker's spider sense, making him easily avoidable every time.
Frustrated, Jameson decided to pay $10,000 to Gargan to be the subject of an experiment. The experiment, created by Dr. Farley Stillwell, a researcher in animal mutation, which endowed the subject with the characteristic of another animal. Unfortunately the process resulted in the loss of Gargan's sanity, and the creation of the super-powered criminal menace known as the Scorpion.
Over the years Scorpion fought and was bested by Spider-Man many times. Most of these confrontations were the result of Spider-Man stepping in on an attempt on the life of Jameson, who Gargan hated even more than Spider-Man.
Scorpion attacked Jameson on his wedding day, but failed thanks to Spider-Man.
Egghead recruited Scorpion into his Masters of Evil, but when Whirlwind jumped the gun and attacked the Avengers early, the Masters were all recaptured. When the Masters reformed, Egghead didn't bother recruiting Scorpion again.

Justin Hammer had his people improve the weaponry in Scorpion's tail before sending him on a mission. However, Gargan proved too unstable to follow orders and bungled the mission. Hammer sent Blacklash and Rhino to punish Scorpion for botching the job.The forces of Llan the Sorcerer once lured Scorpion into attacking Canada, where he brawled with Alpha Flight.Gargan had the Tinkerer perform further upgrades on his tail. As the Scorpion, he got in the middle of a fight between Spider-Man and the Spider-Slayers. Gargan inadvertently defeated himself by electro-shocking an amoeboid robot and got caught in the feedback.In his borderline demented state, Gargan took to living in the sewers for a time.

Hiring out to RoXXon Oil, Gargan was given a new tail with heavily upgraded weaponry. Once again, he kidnapped J. Jonah Jameson but was eventually stopped by Spider-Man with the help of Power Man and Iron Fist.Gargan was next recruited by a mysterious corporation who upgraded his tail and armor. He fought Spider-Man while attacking the Tri-Corp research facility.
For some reason, Scorpion went back to using his older costume.He tried to kill Jameson again when JJJ was on trial for defamation against Spider-Man.